org.simantics.g3d/src/org/simantics/g3d/shape/Cone.java

   1 package org.simantics.g3d.shape;\r
   2 \r
   3 import java.util.ArrayList;\r
   4 import java.util.List;\r
   5 \r
   6 import javax.vecmath.AxisAngle4d;\r
   7 import javax.vecmath.Vector3d;\r
   8 \r
   9 import org.simantics.g3d.math.MathTools;\r
  10 \r
  11 public class Cone {\r
  12 \r
  13         public static Mesh create(double radius, int s) {\r
  14                 if (s < 3 || radius < MathTools.NEAR_ZERO)\r
  15                         throw new IllegalArgumentException();\r
  16                 List<Vector3d> vertices = new ArrayList<Vector3d>(s+2);\r
  17                 List<Vector3d> normals = new ArrayList<Vector3d>(vertices.size());\r
  18                 List<Integer> indices = new ArrayList<Integer>();\r
  19                 \r
  20                 vertices.add(new Vector3d(0.0,0.0,0.0));\r
  21                 normals.add(new Vector3d(0.0,-1.0,0.0));\r
  22                 vertices.add(new Vector3d(0.0,radius*2.0,0.0));\r
  23                 normals.add(new Vector3d(0.0,1.0,0.0));\r
  24                 \r
  25                 Vector3d v = new Vector3d(radius,0,0);\r
  26                 for (int i = 0; i < s; i++) {\r
  27                         AxisAngle4d aa = new AxisAngle4d(0,1,0,((double)i/(double)s)*Math.PI * 2);\r
  28                         Vector3d t = new Vector3d();\r
  29                         MathTools.rotate(MathTools.getQuat(aa), v, t);\r
  30                         vertices.add(t);\r
  31                         Vector3d n = new Vector3d(t);\r
  32                         n.normalize();\r
  33                         normals.add(n);\r
  34                 }\r
  35                 \r
  36                 for (int i = 0; i < s; i++) {\r
  37                         indices.add(0);\r
  38                         \r
  39                         if (i < s - 1)\r
  40                                 indices.add(i + 3);\r
  41                         else\r
  42                                 indices.add(2);\r
  43                         indices.add(i + 2);\r
  44                 }\r
  45                 \r
  46                 for (int i = 0; i < s; i++) {\r
  47                         indices.add(1);\r
  48                         indices.add(i + 2);\r
  49                         if (i < s - 1)\r
  50                                 indices.add(i + 3);\r
  51                         else\r
  52                                 indices.add(2);\r
  53                         \r
  54                 }\r
  55                 return new Mesh(vertices,normals,indices);\r
  56                 \r
  57         }\r
  58         \r
  59         public static void main(String arg[]) {\r
  60                 Mesh s1 = create(1.0, 3);\r
  61                 Mesh s2 = create(1.0, 4);\r
  62                 System.out.println("debug " + s1 + "\n" + s2);\r
  63         }\r
  64 }\r